Depth-dependent fct to fcc strain relaxation in CoxNi1−x/Cu3Au(1 0 0) alloy films |
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Authors: | Bo-Yao Wang Wen-Chin Lin Yu-Wen Liao Ker-Jar Song |
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Institution: | a Department of Physics, National Taiwan University, 1 Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan, ROC b Institute of Atomic and Molecular Sciences Academia Sinica, Taipei 10617, Taiwan, ROC c TIGP, Academia Sinica, Taipei, Taiwan, ROC |
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Abstract: | CoxNi1−x/Cu3Au(1 0 0) with x ? 11% was prepared at room temperature to study the strain relaxation and their correlation with the spin-reorientation transition. The vertical interlayer distance relaxed from 1.66 Å (fct) to 1.76 Å (fcc) while the thickness increased from 8 ML to 18 ML. Such rapid strain relaxation with thickness was attributed to the larger lattice mismatch between CoxNi1−x and Cu3Au(1 0 0) (η ∼ −6.5%). The smooth change for crystalline structure was observed during strain relaxation process in which the crystalline structure seems irrespective of the alloy composition. To explain the strain relaxation, a phenomenological model was proposed. We provide a physical picture that the deeper layers may not relax while the surface layer start to relax. This assumption is based on the several experimental studies. Using the strain averaged from all layers of thin film as the volume strain of magneto-elastic anisotropy energy, the interrelation between strain relaxation and spin reorientation transition can be well described in a Néel type magneto-elastic model. |
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Keywords: | Co Ni Alloy Magnetic ultrathin film Strain relaxation Spin-reorientation transition |
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